Border Centering Pokemon cards have a distinct yellow border around them
Grass types' abilities to keep themselves healthy with healing abilities plus Hydrapple ex's Energy acceleration allows it to keep up with the competition, especially with its 330 HP
They wanted to create a game that both kids and adults could enjoy
Plus, Eye of Ugin gave Tron decks an inevitable late game, which would likely push them over the top at the moment, considering Tron is still near the top of the format even without Eye of Ugin
But this only works for cards found in main sets and to a lesser extent special sets since they're usually kept in production for a while (and if what TPCi said in the past is true, will continue to be printed as long as there's demand for 'em and they're not rotated out), this rule doesn't work for promos since they're usually only given away during a certain window of time and given a limited print run that's long enough to fit the predicted demand
Thanks for reading, and Ill see you in the next one